JACOBI, Moritz Hermann (1801-74). A German physicist and architect, brother of Karl Gustav Jacobi. He was born at Potsdam. In 1835 he became professor at the University of Dorpat, and in 1842 a member of the Saint Petersburg Academy of Sciences. He invented galvano-plastics and electrotyping, and carried out numerous important researches in physics. He wrote Mémoire sur l'application de l'électro-magnetisme au mouvement des machines, a remarkable essay published in 1835; and DieGalvanoplastik (1840). Consult Wild, ZumGedächtnis an Moritz Hermann Jacobi (Leipzig, 1876).